Casella CEL CEL-393 - Manual (Page 27)

The various memory modes are as described above in Chapter 1, and
it is important to note that three of the modes are linked to the selected
period time as set out below, whilst the fourth mode is available only
when the frequency analyser is being used.
i. Profile Mode for period times 1 - 4 minutes,
ii. Environmental Mode for period times from 5 - 999 minutes,
iii. Event Mode for a period time of 9999 minutes. (0C),
iv. Frequency Analysis Mode (only in conjunction with analyser).
The procedure for setting the period times has been dealt with in the
section dealing with the clock. The selected period time may be read on
the display by operating the C key twice, and the memory mode deter-
mined from this display.
At the end of each of the selected measurement periods, answers will
be calculated and stored in the memory in both the Profile and Environ-
mental modes. In the Event mode, answers are stored only when the
signal level has made an excursion beyond 20dB above the measure-
ment range datum and back again. In Frequency Analysis mode, the
results of automatic filter sweeps are stored.
To read the results from memory, the following procedures should be
followed for each memory mode. When answers from the memory are
brought to the main display, the parameter mnemonic alternates with the
memory mnemonic (
) to differentiate them from current period
results.
Profile Mode
In this mode, operation of any numeral key followed by M will bring to
the display the first L
eq answer that was stored in the memory. Sub-
sequent operations of the M key step through the memory, displaying
each period result in turn, until the most recent is reached. If unused
393 Handbook /23.